Walking across the field looking over Wrington Vale to the south and towards Bristol Airport to the north this morning at between 7.30am and 7.45am, I suddenly realised that, for once, I was hearing nothing but natural sounds. No man-made sounds were intruding - not from the airport, not even from the A38 Taunton road in the valley. So I stopped and recorded this. By the next day - Sunday - the skies were still silent, but not empty.